i86 DISCOVERY REPORTS 



Family KORETHRASTERIDAE Danielssen & Koren 



KoRETHRASTERiDAE Danielsscn & Koren, 1884; Bell, 1892; Gregory, 1900; Fisher, 1905, 1911, 



p. 340 {q.v.). 

 KoRETHRASTERiNAE Sladen, 1 889; Perrier, 1904. 



Spinulosa superficially resembling the Solasteridae but differing in lacking a calcified 

 interbrachial septum, actinal intermediate plates, paxilliform inferomarginals ; armature 

 of adambulacral plates forms with that of inferomarginal a single transverse series of 

 spines, never webbed; abactinal skeleton composed of roundish plates or lobed plates, 

 in Peribolaster connected by slender ossicles forming an open mesh; abactinal plates 

 bearing a tuft of acicular or flattened spatulate spinelets, either independent or united 

 by a sacculus ; mouth-plates resembling those of Pterasteridae, but spines never webbed. 



Genus Remaster Perrier 

 Remaster (subgenus) Perrier, 1894, p. 161. Type Korethr aster palmat us Perrier. 



Remaster gourdoni Koehler 

 Remaster gourdoni Koehler, 1912, p. 60, pi. 5, figs. 4, 5, 9, 12; pi. 8, fig. 7.— 1923, p. 76, pi. 9, fig. i. 

 St. 140. Stromness Harbour to Larsen Point, South Georgia, 122-136 m., green mud and stones, 



1 specimen. 



St. 141. East Cumberland Bay, South Georgia, 17-27 m., 6 specimens. 



St. 145. Stromness Harbour, South Georgia, 26-35 m., i specimen. 



St. 159. South Georgia, 53° 52' 30" S, 36° 08' W, 160 m., rock, 19 specimens. 



St. 170. Off Cape Bowles, Clarence Island, 61° 25' 30" S, 53° 46' W, 342 m., rock, 5 specimens. 



St. WS 177. South Georgia, 54° 58' S, 35° W, 97 m., i specimen. 



St. MS 71. East Cumberland Bay, South Georgia, 120-60 m., i specimen. 



Large specimens, sexually mature, measure: R 10-12 mm., r 6-7 mm., measured to 

 apparent interbrachial angle and not bottom of sulcus. Koehler 's largest example 

 measured R 11-5 mm., r 6 mm. 



The external characters of this species have been described and figured by Koehler 

 who was the first to accord the group generic rank. There is one unfortunate error in 

 Koehler's description. He states (1912, p. 62): "Entre la rangee marginale ventrale et 

 les plaques adambulacraires, s'etendent, sur toute la longueur des bras, deux rangees 

 regulieres de plaques latero-ventrales, dont chacune porte un piquant compose, elargi 

 a I'extremite et comparable a ceux de la rangee marginale ventrale, mais moins epais et 

 comprenant un nombre moins eleve de piquants elementaires " (that is, each spine has 

 fewer dorsoventral calcareous rods). 



As a matter of fact there are no actinal intermediate (lateroventral) plates whatsoever. 

 The very broad, but short adambulacral plates overlap the inferomarginal series, but do 

 not correspond plate for plate with the latter. The proximal inferomarginal plates are 

 also wide, but rapidly shorten beyond the basal third of the ray. 



The two series of lateroventral spines of Koehler's description are in reality the outer 



2 of the transverse series of 3 prominent subambulacral spines. On the proximal half of 



